Radiohorn



May 28, 1929.

p. KIRK RADIO HORN Filed Feb. 2, 1927 2 Sheets-Sheet l fz Ilm' E 'Z6 r l zo E I9 fida lab 10 E""mc /ac lla. "a

' lad l /5 I 1 l /a xNvENToR i? ,6 i /5 9M m44' BY [.8 TORNEY May28,1929. D. KIRK' `1,114,510

RADIO HORN v Filedl Feb. 2, 1927 2 Sheets-Sheet 2 INVENTORl @M m I ATTORNEY Patented May 28, 1929.

DANIEL KIRK, F GLEN COVE, NEW YORK.

RADIOHORN.

Application filed February This invention relates to sound producing or modifying means and has particular reference to sound amplifying means intended for use in connection with loud speakers of radio equipment or the equivalent.

Among the objects of the invent-ion is to provide a horn structure designed particularly for augmenting the sound delivered from or through a loud speaker and with such quality as to render the same delight-k fully soft in quality and natural in character.

lVith the foregoing and other objects in view the invention consists in the arrange ment and combination of parts hereinafter described and claimed and while the invention is not restricted to the exact details of construction disclosed or suggested herein, still for the purpose of illustrating a practical embodiment thereof reference is had to the accompanying drawings in which Vlike reference characters designate the same parts in the several views, and in which- Figure 1 is a vertical central transverse f section of my improvement.

Fig. 2 is a front elevation of the same.

F ig. 3 is a horizontal section substantially on the line 3-3 of 1 and with parts broken away.

p Fig. lis' a horizontal section on the line 4 4 of Fig. 1.

Fig. 5 isa vertical line 5 5 of Fig. 3.

Referring now more specifically to the drawings I show a horn construction comprising three main parts`a tapered body portion or horn proper 10, a base 11, and a head portion 12.

The body comprises a series of nested members having approximately similar form in cross section and indicated herein as of square section, but to which form I do not propose to be unnecessarily limited in practice. The several parts of the body as shown herein and as practised by nie extensively, comprise aiiouter tubular shell or casing 13, the same being tapered or of frusto-pyramidal form, tapering and fiaring upward from the small end 13a, shown herein as being at the bottom. This shell or casing 18 is made preferably of wood of uniform thickness. lVithin the shell 13 is a composite resonator 14, coextensive in length with the shell 13, and consisting of two tubular portions 14a and 14h, the former being within the latter and the two being sectional detail on the 2, 1927'. semi No. 165,270.

secured intimately and rigidly together as by means of cement'indicated at 14. The inner part of the resonator is formed preferably of a good quality of heavy cardboard, while the outer portion thereof 14h consists of sheet metal such as a good quality of galvanized iron. The lower end of the resonator .is fitted or built snugly in the lower end 13a of the shell 13, and secured to the ends of these parts is a cap 15 of any suitable material such as wood which is adapted to be secured to the lower end of the shell 13 as by means of cement, screws, or other fasteners, the cap having a central hole 1G into which the nipple 17 of the loud speaker 18 is adapted to be secured as by screwing, the nipple end of the loud speaker thus communicating with the small mouth portion 14d of the resonator.

Any suitable means may be provided to support the horn body and in order to hold it erect as indicated, I provide a base comprising a plurality of legs 11a having spaced feet to rest upon the floor and provide a clear space for the application and accommodation of the loud speaker and whatever connections may be required for it. These legs are shown glued or otherwise secured to the respective outer surfaces or walls of the shell 13.

The resonator 14 toward its upper kor bell end has less flare than has the shell 13 and consequently there `is left a tapering space 19 between the shell and the resonator, said space having its widest area at the bell end of the horn body, it flaring all the way from Zero at the loud speaker end up to the bell end, and since the parts or elements making up the parts are straight, this taper or tlare is uniform throughout the length of the body. the body 10 is constructed of straight elements, havingno pronounced bell formation in itself. The resonator while having snug contact in and with the shell at the end 13a, is free therefrom all the way between the ends, The bell end of the resonator must be supported so as to maintain the proper spacing of substantial uniform dimension with respect to the shell 13, and as a result of extensive careful experiments, I have discovered that the spacing means are of peculiar construction oi' character to produce the best results. For example, blocks of wood, pins, or the like interposed between the resonator and the shell proved unsatis- Except for the flare just described, I

factory. 'Conseqiiently what VI employ for this purpose and whichV I believe to be the best adapted as tie or spacing means are a plurality of. tie members in the form vof pieces of tape20, each of which has one end glued or otherwise secured upon the inner surface of the resonator and extended thence upward and outward across the edge of the resonator and thence directly and horizontally facross the proximate edge ofV the bell portion of the casing 1 3 Where it isV secured as by means of fasteners 2l or.

their yequivalent driven intoV the end of the shell wall. ln practice the end on the inside of Athe resonator is secured in place first, and then'while the tape is still a part of a longl piece, it is drawn outward described by force applied to the bulk portiony of the tape, whereby a substantial degree of tautness is produced in the tie member.

The head l2, secured to the bell end of the body l0, islof materially larger expanse and constitutes in effecta sound .delivery bell.l

rlfhis structure as viewed in front and.l side elevations is illustrated as substantially rectangular, but as viewed in plan or horizontal section, it is preferably made widei in front than at the rear.

The structure as shown comprises a. casing having a grille-like or reticulated front wall 22, a narrow rear wall 23,.and vertical side l'walls 24, fla Ting from each other aS they 21D- v the head.

Vthe edges ofthe panel 25 but is located preferablyjbaclt of the 'center thereof or closerto'the rear wall 23 than the front wallv of VVithin the shelljust ldescribed is a sound dome` or reflector 27 which is made preferf ably as a segment of a hollow cylinderfthe axis of whichis located at some convenient point below and in front of 'the head. This dome4 is secured at its lower edge adjacent to the 'joint between the bottoiiipanel 25 Vand the lo'wei edge of the rear panel Y' 23 of the shell and it curves thence up# ward and forward till its frontupper edge Vcommunicates with the shell at the joint between the front panel 22 andthe top panel 28, wherebyvthe sound deliveredV through the opening 26 is deflected upward and forward without material. distortion and with a pronounced augmentation of the vol unie and softness and purity of timbre. rIhe head' is secured rigidly and tightly tothe upper edge ofthe bell and the shell 13, any

-suitable fasteners with or without glue being used for this purpose. ll'show, however, the application of glue at 29. rlhe dome 27 is made preferably from the same hind 'of material as is usedfor the inner portion of the resonator, a material not only well adaptedv for the formation of the curved structure', but one which is'peciiliarly suitablyadapted Y` for the tonal ornii'isical e'ect.

l claim:` n 1 l. The herein comprising an outer wooden horn, ian' inner lioin spaced therefrom, the inner horn being a libre horn vhaving a metal sheathing7 the said horns enlarging towardv tlieirends, and

flexible. adhesive tape securingthe yhorns in predetermined spaced relation at said ends.

2. The 'herein described sound amplifier comprising an outer wooden Vhorn,r an inner horn spaced therefrom,'the inner horn being made of a rigid material interior'ly lined with va papery material, and flexible tape securing the horns in predetermined spaced relation.

described sound amplifier In testimony whereof I affix my signature.

Y DANIEL Krait; 

